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The INTERNET550SER ultra-compact standby UPS with a built-in DB-9 serial monitoring port protects PCs, network workstations, and other systems reliant upon a basic communications interface for UPS monitoring and unattended system shutdown. This UPS maintains AC output during blackouts and brownouts starting at 99V. The item includes the DB-9 monitoring port with cabling, TEL/DSL line surge suppression jacks, surge only outlets and LED indicators.